MAX5951 Maxim Integrated Products, MAX5951 Datasheet

MAX5951

Manufacturer Part Number

MAX5951

Description

Buck PWM Controller

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX5951.pdf (25 pages)

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The MAX5951 is a 12V pulse-width modulated (PWM),

step-down, DC-DC controller. The device operates over

the input-voltage range of 8V to 16V or 5V ±10%, and

provides an adjustable output from 0.8V to 5.5V. The

device delivers up to 10A of load current with excellent

load-and-line regulation.

The MAX5951 PWM section utilizes a voltage-mode

control scheme for good noise immunity and offers

external compensation, allowing for maximum flexibility

with a wide selection of inductor values and capacitor

types. The device operates at a fixed switching fre-

quency that is programmable from 100kHz to 1MHz

and can be synchronized to an external clock signal

though the SYNCIN input. The device includes under-

voltage lockout (UVLO) and digital soft-start. Protection

features include lossless valley-mode current limit, hic-

cup-mode output short-circuit protection, and thermal

shutdown.

The MAX5951 is available in a space-saving 5mm x

5mm, 32-pin thin QFN package and is specified for

operation over the -40°C to +85°C extended tempera-

ture range. Refer to the MAX5950 data sheet for a pin-

compatible PWM controller with hot swap.

19-0546; Rev 0; 5/06

PCI-e Express Modules is a trademark of PCI-SIG.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PCI-e Express Modules™

General 12V or 5V Input PWM Controllers

Blade Servers

RAID

Base Stations

Workstations

________________________________________________________________ Maxim Integrated Products

General Description

12V/5V Input Buck PWM Controller

Applications

♦ 8V to 16V or 5V ±10% Input-Voltage Range

♦ Lossless Valley-Mode Current Sensing

♦ Output Voltage Adjustable from 0.8V to 5.5V

♦ Voltage-Mode Control

♦ External Compensation for Maximum Flexibility

♦ Digital Soft-Start

♦ Sequencing or Ratiometric Tracking

♦ Startup Synchronization

♦ Programmable PGOOD Output

♦ Programmable Switching Frequency from 100kHz

♦ External Frequency Synchronization

♦ SYNCIN and SYNCOUT Enable 180° Out-of-Phase

♦ Thermal Shutdown and Short-Circuit Protection

♦ Space-Saving, 5mm x 5mm, 32-Pin TQFN Package

+Denotes lead-free package.

MAX5951ETJ+

TOP VIEW

to 1MHz

Operation

PART

PGND

DREG

BST

REG

CS-

-40°C to +85°C

TEMP RANGE

Ordering Information

(5mm x 5mm)

MAX5951

TQFN

Pin Configuration

PIN-

PACKAGE

32 TQFN

Features

16 SYNCIN

15 SYNCOUT

AGND

THRESH

DCENI

N.C.

T3255-4

CODE

PKG

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